User Manual of EM730 Series Inverter 0000 : return the data transferred in the request data field in the response. All messages should be consistent with the request message. The following table is an example of requesting the remote terminal unit to return query data. The sub-function code 0000 is used. The returned data is sent in the two-byte data field (0xA537). 1.1.1.5 0x06: function code used to write a single register or command In the remote terminal unit, this function code is used to write a single holding register. The request PDU describes the address to be written to the register.
The normal response is the response made to the request, which is returned after the register content is written. Request PDU Response PDU 376 Sub-fun ction Meaning Data field (request) Data field (response) 0000 Return query data Any Copy request data …
Request Respond Domain name (0x) Domain name (normal) (0x) Domain name (abnormal) (0x) Function 08 Function 08 Function 88 Sub-function code Hi 00 Sub-function code Hi 00 Exception code 03 Sub-function code Lo 00 Sub-function code Lo 00 Data Hi A5 Data Hi A5 Data Lo 37 Data Lo 37 Function code 1 byte 0x06 Address of register 2 bytes 0x0000 - 0xFFFF Register value 2 bytes 0x0000 - 0xFFFF Function code 1 byte 0x06 Address of register 2 bytes 0x0000 - 0xFFFF Register value 2 bytes 0x0000 - 0xFFFF